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. 2022 Nov 2;17(11):e0276929. doi: 10.1371/journal.pone.0276929

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© 2022 Kirchner et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 4 — Cellular immunity was quantified by IFN-γ production upon stimulation with various SARS-CoV-2 peptide pools in ELISPOT assays normalized to numbers of circulating PBMCs (A) as well as CD3⁺ T cells (B) in immunosuppressed COVID-19 convalescents after liver transplantation (OLT, dark grey) compared to matched non-IS convalescents (non-IS; light grey) before the corona pandemic (pre) and in the first year after COVID-19 (m = months; vacc. = vaccination).